Inverted negation in if/else statement

[ghost]

inverted negation in if/else statement
Fixes #11417

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This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/8775009774/artifacts/398203166

[TildaDares]

Resolved in #11484